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Segment Reporting Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 01, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 5,556 |  | $ 3,396 | $ 5,731 |  | $ 8,952 |  | $ 9,525 |  |  |
Segment operating EBITDA | 1,486 |  |  | 1,581 |  | 2,031 |  | 2,344 |  |  |
Segment Assets | 39,828 |  |  | 44,441 |  | 39,828 |  | 44,441 |  |  | $ 38,632
Goodwill | 10,249 |  |  | 14,612 |  | 10,249 |  | 14,612 |  | $ 10,179 | 10,193
Seed [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 3,699 |  |  | 3,864 |  | 5,666 |  | 6,165 |  |  |
Segment operating EBITDA | 1,036 |  |  | 1,158 |  | 1,361 |  | 1,598 |  |  |
Segment Assets | 26,623 | [1],[2] |  | 34,703 | [1] | 26,623 | [1],[2] | 34,703 | [1] |  | 29,286
Goodwill | 5,490 |  |  |  |  | 5,490 |  |  |  | 5,453 | 0
Crop Protection [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 1,857 |  |  | 1,867 |  | 3,286 |  | 3,360 |  |  |
Segment operating EBITDA | 450 |  |  | 423 |  | 670 |  | 746 |  |  |
Segment Assets | 13,205 | [1],[2] |  | $ 9,738 | [1] | 13,205 | [1],[2] | $ 9,738 | [1] |  | 9,346
Goodwill | $ 4,759 |  |  |  |  | $ 4,759 |  |  |  | 4,726 | $ 0
Reallocation of goodwill [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 3,382 |
[1] | Segment assets at December 31, 2018 were $29,286 million and $9,346 million for Seed and Crop Protection, respectively. The reduction in segment assets between June 30, 2018 and December 31, 2018 was driven by the goodwill impairment recorded in the third quarter of 2018.
[2] | On June 1, 2019, as a result of changes in reportable segments, $3,382 million of goodwill was reallocated from the Seed reportable segment to the Crop Protection reportable segment. This change was not reflected in segment assets prior to June 1, 2019.

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